Here's why. The "stock" electrical system is made to handle 55W and 60W bulbs for High beams, low beams, and fog lights. Remember, euro cars came standard with these lights. And there is no (major) difference in the the wiring harnesses between US and euro (as far as capacity and being able to handle higher draw components). If you upgrade a US car to Hella 55W and 60W lows and highs, then you should have no problems whatsoever, and you don't need to run higher amp fuses. Remember, the US car came with sealed beam lows and highs rated at about 20-30W each, so the jump to 55W/60W Hellas is exceedingly good.

If you run 100W lows/highs, then you *might* run into problems, but it all depends on your electrical system and its condition. I run 100W highs, and 55/60W lows, and 100W fogs on my M535i, with no fuse changes, or any other changes. Of course high beams I use sparingly, and same for fog lights. But I will tell you that 100W high beams are a blessing! So far (after 9 months and much driving), no burnt fuses, or any problems. Actually, one problem you will find is that with 100W bulbs, the lights get exceedingly hot, so high speed cooling is definitely appreciated. (Sorry Officer, but i have to go 90 mph in order to cool my lights!...right...)

If you're really worried about the higher draw, run "euro" stock 55W high, lows, and fogs. It works exceedingly well, and are as good as many new car systems.

Christopher GraffHead CoordinatorM535i SIG

I just installed the Hella H1 high beams to my 87 535is. Has anyone had problems with these headlights frying the stock electrical system? I have had the Hella low beams in for over a year without any problems, but I have heard that the high beams draw a ton a current.